Drilling mechanism



June 3, 1930. c. F. osGooD DRILLING MECHANISM Filed May 24, 1923 Patented June 3, 1930 UNITED STATES PATENT oFFllcE CHARLES F. OSGOD, OF CLAREMONT, NEW HAMPSHIRE, ASSIGNOR T0 SULLIVAN MACHINERY COMPANY, A CORPORATION 0F MASSACHUSETTS DRILLING MECHANISM Application mea May 24, 1923.

My invention relates to drilling mechanisms, and more particularly to drilling mechanisms of the pneumatically fed type.

An object of my invention is to provide an VimprovedV drilling mechanism. Another object ofmy invention is to provide an improved controlling device for pressure Huid rock drills. A further object of my invention is to provide an improved controlling device for pressure Huid rock drills of the Vpneumatically fed type whereby the feeding mechanism automatically controls the rotation motor. A still further object of my invention is to provide an improved controlling device for pressure fluid rock drills of the pneumatically fed type responsive to the variations in pressure within the feeding mechanism for automatically controlling the rotation `motor. Other objects and advantages of my invention will hereinafter more fully appear.

In the accompanying drawings I have shown for purposes of illustration one form which my invention may assume in practice.

In these drawings,-

F ig. 1 is an elevational view, partially in central longitudinal section, of a drilling mechanism embodying my improved device.

F ig. 2 is a transverse section taken on line 2-2 of F ig. 1.

In this illustrative form of my invention I have shown a ystoper drill of standard form, generally designated 1, including a drilling motor 2 and a feeling mechanism 3. The drilling motor 2, herein of the valveless percussive type, comprises a cylinder 4 having a hammer piston 5 reciprocable therein, in a stepped bore 6,'to actuate percussively a drill steel 7 suitably carried in a chuck 7 in the front end of the drilling motor. The feeding mechanism 3 comprises a cylinder 8 having a piston 9 disposed therein and having suitably secured thereto a piston rod 10 terminating in a point 11. Interposed between the drilling motor 2 and the feeding mechanism 3 is a head block 12 having a bore 13 therein forming a continuation of the bore 6 in the cylinder 4, the feed cylinder, head block, and drilling motor parts being suitably held together by said rods 12', in a well known manner. Suitably secured to the head block 12 is also Serial No. 641,097.

a handle 15 employed to support the machine during the drilling operation.

An independent pressure iiuid actuated rotation motor, generally designated 16, is provided, in this instance, to vrotate the drill steel 7 and comprises a pair of intermeshing toothed rotors 17 and 18 disposed in a bore 19 in a casing 19 formed integral with the cylinder 4. The rotor 17 is operatively connected through a shaft 20 disposed parallel with the cylinder 4, mounted in suitable bearings'and having a pinion 21 secured thereto meshing with a gear 22 formed on the chuck 7 Pressure iuid is supplied to the machine through athrottle valve 23 arranged in a boss formed on the head block, from any suitable source of supply, and passes through a port 24 to the feed cylinder 8 and through a port 25 to a constant pressure chamber 26, formed in the head clock, and then tothe rotation motor, under the control of the automatic control valve, generally designated 27, through a port 28. The valve 27 comprises a conical, or tapered, head 29 which graduates the admission of pressure fiuidto the rotation motor, having a cut-away portion, or slot, 30 in Y its tapered side so that when thev valve 27 is seated pressure fluid will pass to the rotation motor. At the opposite end of the valve 27 which extends a follower 36 adapted to apply pressure to a spring 37 acting on the head 31 and tending to hold the valve open, the spring pressure in the chamber 32 resisting 'the main line pressure in the chamber 26 and tending to force the valve to open position. The type of valve shown is used for illustrative purposes only, the particudar type of valve used to accomplish the desired result being immaterial. y

The mode of operation will be clearly apparent from the description given. The point 11 is placed against a suitable abutment, herein the mine bottom, at a proper distance from the working face, the operator holding the machine in position at this time by means of a handle l5. The throttle valve 23 is then manipulated admitting pressure fluid to the feeding mechanism and to the pressure chamber 26 seating the valve 27, the pressure in the feed cylinder then acting on the left hand side of the head 31 and overcoming the spring 37. Pressure fluid then passes through the slot 30 bringing the rotation motor 16 up to a speed required in normal drilling conditions. As the drilling motor, actuating the steel 7, deepens the hole, the feed cylinder 8 moves upward relative to the piston 9. I/Vhen, however, a soft spot or cavity is encountered, the cylinder 8 moves rapidly upward relative to the piston 9 tending to stick the drill steel, and in so doing materially reduces the pressure in the chamber 32 and causes the pressure to drop at the left hand side of the piston head 31 of the valve 27 and thereby permit the spring 37 to force the valve open and admit more pressure fluid to the rotation motor, thereby increasing its speed and power to free the drill steel. IVhen normal drilling is resumed the pressure again builds up in the feed cylinder, overcoming the spring 37 and slowing down the speed of the rotation motor.

IVliile I have in this application specifically described oiie form which my invention may assume in practice, it will be understood that this form of the same is shown for purposes of illustration and that the invention may be modified and embodied in various other forms without departing from its spirit or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

l. In combination, work performing means including a rotary tool actuating motor, a tool actuated thereby, pressure fluid actuated feeding means for said tool, and means having communication with said feeding means and automatically controlled by pressure changes in said feeding means for controlling said rotary motor.

2. In combination, work performing means including a tool rotating motor, a tool rotated thereby, feeding means for said tool, and means operatively connected to said feeding means and automatically effective when an abnormal rate of feeding movement occurs due to a substantial decrease in the resistance to feeding movement for controlling said tool rotating motor.

3. In combination, work performing means including a tool actuating motor, a tool actuated thereby, pressure fluid actuated feeding means for said tool, and automatic control means having communication with said feeding means and controlled by pressure changes in said feeding means and effective to speed up said tool actuating motor when the pressure in said feeding means is reduced.

4. Incombination, work performing means comprising a motor for imparting motion to a tool, a tool actuated thereby, pressure fluid actuated feeding means for said tool, and means having communication with said feeding means and automatically controlled by pressure changes in said feeding means and effective to speed up said tool actuating motor when the pressure in said feeding means is reduced.

5. In combination, a drilling motor, a drill steel actuated thereby, feeding means for said steel, a motor for rotating said steel, and means operatively connected to said feeding means and automatically effective when an abnormal rate of feeding movement occurs due to a substantial decrease in the resistance to feeding movement foi' controlling said rotation motor.

6. In combination, a drilling motor, a drill steel actuated thereby, feeding means for said steel, a motor for rotating said steel, means operatively connected to said feeding means and automatically effective when an abnormal rate of feeding movement occurs due to a substantial decrease in the resistance to feeding movement for controlling said rotation motor.

7. In combination, a drilling motor, a drill steel actuated thereby, ainotor for rotating said steel, pressure fluid actuated feeding means for said steel, and means having communication with said feeding means and automatically responsive to pressure changes within said feeding means for controlling said rotation motor.

8. In combination, a drilling motor, a drill steel actuated thereby, means for rotating sai-d drill steel, pressure fluid ctuated feedingmeans for said drill steel, and means having communication with said feeding Vmeans and automatically controlled by pressure changes in said feeding means for controlling said rotation means.

9. In combination, a drilling motor, a drill steel actuated thereby, means for rotatino' 'said drill steel, pressure fluid actuated feedbing means for said steel, and means having communication with said feeding means and automatically controlled by pressure changes in said feeding means for controlling said rotation means. I

l0. In combination, a drilling motor a drill steel actuated thereby, means for rota'ting .said drill steel, feeding means for Said drill steel comprising relatively movable elements, and means operatively connected to said feeding means and automatically effective when an abnormal rate of relative movement between said feeding elements occurs due to a substantial ldecrease in the resistance to feeding movement for controlling said rotation means.

l1. In combination, a drilling motor, a drill steel actuated thereby, a pressure fluid actuated rotation motor for said steel, pressure fluid actuated feeding means for said steel, and pressure controlled means having communication with said feeding means and automatically controlled by pressure changes in said feeding means and effective when an abnormal rate of feeding movement occurs due to a substantial decrease in the resistance to feeding movement for controlling said rotation motor.

12. In combination, a rotation motor, a ldrill steel rotated thereby, a pressure fluid actuated feeding motor for said steel, and means having communication with said feeding motor and controlled by pressure changes in .said feeding` motor for automatically varying the operation ofl said rotation motor.

13. In combination, a rotation motor, a -drill steel rotated thereby, pressure fluid actuated feeding means for said steel, and automatic feed pressure controlled means having communication with said feeding means and operable independently of said rotation motor for automatically controlling the speed thereof. y

14. In combination, a tool actuating motor, a tool actuated thereby, pressure fluid actuated feeding means for said tool, and means having communication with said feeding means and responsive to pressure changes within said feeding means for automatically controlling said tool actuating motor.

15. In combination, a tool actuating motor, a tool actuated thereby, pressure fluid actuated feeding means for said tool, said feeding means having a fluid supply communicating therewith,`and means controlled by pressure changes in said feeding means for automatically controlling said motor including a valve having pressure surfaces and means for subjecting said surfaces to the pressure in said feeding means and said fluid supply, respectively.

16. In combination, a tool actuatingmotor, a tool actuated thereby, pressure fluid actuated feedingV means for said tool, said feeding means having a fluid supply communicating therewith, means controlled by pressure changes in said feeding means for automatically controlling said motor including a valve having pressure surfaces, means for subjecting said surfaces to the pressure in said feeding means and said fluid supply respectively, and means for adjusting the position of said valve.

17. In combination, an independent fluid actuated rotation motor, a drill steel rotated thereby, pressure fluid actuated feeding means for said steel comprising a feed cylinder and a cooperating piston, and means having communication with said feed cylinder and including a pressure actuated valve for automatically controlling the fluid delivered to said motor in accordance with the pressure changes in said feed cylinder.

18. In combination, an independent pressure fluid actuated rotation motor, a drill for said steel, and means operatively con-y nected to said feeding means and automatically eifective when an abnormal rate of feeding movement occurs due to a substantial decrease in the resistance to feeding movement for controlling the speed of said motor in accordance with the nature of the work encountered by said steel.

20. In combination, Work performing means including a tool actuating motor, a tool actuated thereby, a feeding motor for said tool, and means operatively connected to said feeding motor and responsive to the changes of load on said feeding motor for automatically controlling said tool actuating motor.

21. In combination, a tool rotating motor,

a tool rotated thereby, pressure fluid actu' ated feeding means for said tool, and means having communication with said feeding means and automatically controlled by pressure changes in said feeding means for controlling said tool rotating motor.

22. In combination, a tool rotating motor, a tool rotated thereby, feeding means for said tool and means operatively connected to said feeding means and automatically responsive to the changes of load on said feeding means for controlling said tool rotating motor.

23. In combination, a drilling motor, a drill steel actuated thereby, means for rotating said drill steel, feeding means for said steel, and pressure fluid actuated means operatively connected to said feeding means and automatically eective when an abnormal rate of bodily movement of said drilling motor occurs due to a substantial decrease-in the resistance to feeding movement for automatically controlling said rotation means.

24;. In a drilling apparatus, a drilling motor of the hammer type, a fluid actuated rotation motor, a pressure fluid operated feeding` means, and automatic means controlled by pressure changes in said feeding means for supplementing the pressure fluid supply to said rotation motor for increasing the power of the same.

In testimony whereof I affix my signature.

CHARLES F. o'seooD. 

